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Unpaid Losses And Loss Adjustment Expenses (Narrative) (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]        
Incurred losses and loss adjustment expenses, current accident years $ 1,255,767 $ 1,085,215 $ 2,500,098 $ 2,153,910
Favorable (adverse) development on prior years' loss reserves     139,208 122,728
Reinsurance recoverable for retroactive reinsurance transaction (125,067) 0 (125,067) 0
Insurance [Member]        
Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]        
Incurred losses and loss adjustment expenses, current accident years 1,079,450 919,283 2,156,996 1,805,520
Insurance [Member] | Professional liability, Property, Marine and Energy, and Workers Comp, Insurance segment [Member]        
Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]        
Favorable (adverse) development on prior years' loss reserves     169,600  
Insurance [Member] | General Liability [Member]        
Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]        
Favorable (adverse) development on prior years' loss reserves     (53,000)  
Insurance [Member] | Property, Marine and Energy, Workers Comp, and Programs, Insurance Segment [Member]        
Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]        
Favorable (adverse) development on prior years' loss reserves       123,300
Reinsurance [Member]        
Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]        
Incurred losses and loss adjustment expenses, current accident years 176,317 $ 165,932 343,102 $ 348,390
Reinsurance recoverable for retroactive reinsurance transaction $ (125,100)   (125,100)  
Reinsurance [Member] | Professional liability and Property, Reinsurance segment [Member]        
Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]        
Favorable (adverse) development on prior years' loss reserves     $ 20,900